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J Virol. 1990 January; 64(1): 331-338

A 3'-coterminal nested set of independently transcribed mRNAs is generated during Berne virus replication.

E J Snijder, M C Horzinek and W J Spaan

Institute of Virology, Veterinary Faculty, State University of Utrecht, The Netherlands.

ABSTRACT

By using poly(A)-selected RNA from Berne virus (BEV)-infected embryonic mule skin cells as a template, cDNA was prepared and cloned in plasmid pUC9. Recombinants covering a contiguous sequence of about 10 kilobases were identified. Northern (RNA) blot hybridizations with various restriction fragments from these clones showed that the five BEV mRNAs formed a 3'-coterminal nested set. Sequence analysis revealed the presence of four complete open reading frames of 4743, 699, 426, and 480 nucleotides, with initiation codons coinciding with the 5' ends of BEV RNAs 2 through 5, respectively. By using primer extension analysis and oligonucleotide hybridizations, RNA 5 was found to be contiguous on the consensus sequence. The transcription of BEV mRNAs was studied by means of UV mapping. BEV RNAs 1, 2, and 3 were shown to be transcribed independently, which is also likely--although not rigorously proven--for RNAs 4 and 5. Upstream of the AUG codon of each open reading frame a conserved sequence pattern was observed which is postulated to function as a core promoter sequence in subgenomic RNA transcription. In the area surrounding the core promoter region of the two most abundant subgenomic BEV RNAs, a number of homologous sequence motifs were identified.

J Virol. 1990 January; 64(1): 331-338




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